If you’re looking for a designer wedding gown by the likes of Vera Wang, Monique Lhuillier, and Carolina Herrera at a discount, get thee to the just-opened consignment boutique Fabulous Frocks of Alexandria. The store will buy back your gently worn wedding dress and sell it for 30 to 75 percent off retail price. (If you’re looking to sell your gown, check out the store’s ground rules here.) You’ll also find new bridesmaid dresses by Jenny Yoo and accessories by Sara Gabriel, 28P, and Meg Jewelry. The store is now taking appointments for both wedding dress shoppers and sellers; call 703-683-2306 to schedule yours.